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Validity and Reliability of Willingness-to-Pay Estimates

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  • Harry Telser

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  • Karolin Becker
  • Peter Zweifel

Abstract

Background: Discrete-choice experiments (DCEs), while becoming increasingly popular, have rarely been tested for validity and reliability. Objective: To address the issues of validity and reliability of willingness-to-accept (WTA) values obtained from DCEs. In particular, to examine whether differences in the attribute set describing a hypothetical product have an influence on preferences and willingness-to-pay (WTP) values of respondents. Methods: Two DCEs were designed, featuring hypothetical insurance contracts for Swiss healthcare. The contract attributes were pre-selzected in expert sessions with representatives of the Swiss healthcare system, and their relevance was checked in a pre-test. Experiment A contained rather radical health system reform options, while experiment B concentrated on more familiar elements such as copayment and the benefit catalogue. Three attributes were present in both experiments: delayed access to innovation (‘innovation’), restricted drug benefit (‘generics’), and the change in the monthly premium (‘premium’). The issue to be addressed was whether WTA values for the overlapping attributes were similar, even though they were embedded in widely differing choice sets. Two representative telephone surveys with 1000 people aged >25 years were conducted independently in the German and French parts of Switzerland during September 2003. Socioeconomic variables collected included age, sex, education, total household income, place of residence, occupation, and household size. Three models were estimated (a simple linear model, a model allowing interaction of the price attribute with socioeconomic characteristics, and a model with a full set of interaction terms). Results: The socioeconomic characteristics of the two samples were very similar. Theoretical validity tends to receive empirical support in both experiments in all cases where economic theory makes predictions concerning differences between socioeconomic groups. However, a systematic inappropriate influence on measured WTA seems to be present in at least one experiment. This is likely to be experiment A, in which respondents were far less familiar with proposed alternatives than in experiment B. Conclusions: Measuring preferences for major, little-known innovations in a reliable way seems to present particular challenges for experimental research. Copyright Adis Data Information BV 2008

Suggested Citation

  • Harry Telser & Karolin Becker & Peter Zweifel, 2008. "Validity and Reliability of Willingness-to-Pay Estimates," The Patient: Patient-Centered Outcomes Research, Springer;Johns Hopkins Bloomberg School of Public Health, vol. 1(4), pages 283-298, October.
  • Handle: RePEc:spr:patien:v:1:y:2008:i:4:p:283-298
    DOI: 10.2165/1312067-200801040-00010
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    References listed on IDEAS

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    1. James Andreoni, 1995. "Warm-Glow versus Cold-Prickle: The Effects of Positive and Negative Framing on Cooperation in Experiments," The Quarterly Journal of Economics, Oxford University Press, vol. 110(1), pages 1-21.
    2. Peter Zweifel & Harry Telser & Stephan Vaterlaus, 2006. "Consumer Resistance Against Regulation: The Case of Health Care," Journal of Regulatory Economics, Springer, vol. 29(3), pages 319-332, May.
    3. DeShazo, J. R. & Fermo, German, 2002. "Designing Choice Sets for Stated Preference Methods: The Effects of Complexity on Choice Consistency," Journal of Environmental Economics and Management, Elsevier, vol. 44(1), pages 123-143, July.
    4. Horowitz, John K. & McConnell, Kenneth E., 2002. "A Review of WTA/WTP Studies," Journal of Environmental Economics and Management, Elsevier, vol. 44(3), pages 426-447, November.
    5. Andreoni, James, 1989. "Giving with Impure Altruism: Applications to Charity and Ricardian Equivalence," Journal of Political Economy, University of Chicago Press, vol. 97(6), pages 1447-1458, December.
    6. Scott, Anthony, 2001. "Eliciting GPs' preferences for pecuniary and non-pecuniary job characteristics," Journal of Health Economics, Elsevier, vol. 20(3), pages 329-347, May.
    7. Samuelson, William & Zeckhauser, Richard, 1988. "Status Quo Bias in Decision Making," Journal of Risk and Uncertainty, Springer, vol. 1(1), pages 7-59, March.
    8. Johnson, F. Reed & Desvousges, William H., 1997. "Estimating Stated Preferences with Rated-Pair Data: Environmental, Health, and Employment Effects of Energy Programs," Journal of Environmental Economics and Management, Elsevier, vol. 34(1), pages 79-99, September.
    9. Ryan, Mandy & Wordsworth, Sarah, 2000. "Sensitivity of Willingness to Pay Estimates to the Level of Attributes in Discrete Choice Experiments," Scottish Journal of Political Economy, Scottish Economic Society, vol. 47(5), pages 504-524, November.
    10. Harry Telser & Peter Zweifel, 2002. "Measuring willingness-to-pay for risk reduction: an application of conjoint analysis," Health Economics, John Wiley & Sons, Ltd., vol. 11(2), pages 129-139.
    11. Mandy Ryan & Angela Bate, 2001. "Testing the assumptions of rationality, continuity and symmetry when applying discrete choice experiments in health care," Applied Economics Letters, Taylor & Francis Journals, vol. 8(1), pages 59-63.
    12. Scott, Anthony, 2002. "Identifying and analysing dominant preferences in discrete choice experiments: An application in health care," Journal of Economic Psychology, Elsevier, vol. 23(3), pages 383-398, June.
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